Method and apparatus for converting an interlace image to a progressive image
a technology of interlace image and conversion method, which is applied in the direction of picture reproducers using projection devices, signal generators with optical-mechanical scanning, television systems, etc., can solve the problems of user perception of the movement of objects, insufficient quality acquisition, and distortion called combing, etc., and achieve high quality
Inactive Publication Date: 2006-09-26
KK TOSHIBA
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Benefits of technology
The present invention provides an image scan conversion method and apparatus that can convert an interlace image signal to a progressive image signal with high quality. The method and apparatus involve deciding whether each pixel of the image is in a static area or a moving area and outputting the pixel data of the same pixel in a corresponding line of the progressive image as either pixel data of the same pixel or interpolated data of the same pixel along temporal and spatial directions. This allows for a smooth and seamless transition between frames of the image. The technical effect of this invention is to provide a better image quality and a more visually appealing user experience.
Problems solved by technology
In this way, if one line consisting of actual pixel of one field and the other line consisting of interpolated pixel of low spatial resolution are mutually located as the progressive image, distortion called combing occurs and sufficient quality is not acquired.
Accordingly, a user perceives the object's moving such as time lapse and feels unnaturality.
Method used
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first embodiment
[0036]FIG. 6 is a block diagram of an image scan conversion apparatus (IP conversion apparatus) according to the present invention. The interlace image signal is input to an input terminal 10. The interlace image signal is delayed by one field period by a (first) field memory 11 and delayed by one line period by a (first) line memory 12. The output signal from the first field memory 11 is input to a (second) line memory 13 and further delayed by one line period.
[0037]A (first) interpolation unit 14 inputs output signals from the first field memory 11 and the second line memory 13, and interpolates pixel data of a bottom field at a previous timing of one field period. A (second) interpolation unit 15 inputs an interlace image signal from the input terminal 10 and output signals from the first line memory 12 and the second line memory 13, and creates interpolation pixel data of odd number line of a progressive image signal. A (third) interpolation unit 16 inputs the interlace image si...
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An interlace image signal is converted to a progressive image signal. It is decided whether each pixel of one of the first field and the second field is in a static area or a moving area. If a pixel of one field is in the static area, pixel data of the pixel of the one field and pixel data of a corresponding pixel of the other field are output as pixel data of the same pixels of an odd number line and an even number line in the progressive image. If a pixel of the one field is in the moving area, interpolated data of the pixel of the one field and interpolated data of a corresponding pixel of the other field are output as pixel data of the same pixels of an odd number line and an even number line in the progressive image. The interpolated data is filtered pixel data along temporal direction and spatial direction.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority from the prior Japanese Patent Application P2002-089779, filed on Mar. 27, 2002; the entire contents of which are incorporated herein by reference.[0002]1. Field of the Invention[0003]The present invention relates to an image scan conversion method and an apparatus for converting an interlace image to a progressive image.[0004]2. Background of the Invention[0005]In proportion to improvement of computer ability, an image such as television or video is often played on a computer display. In general, a television signal and a video signal are an interlace image signal. On the other hand, an image signal of the computer is a progressive image signal. Accordingly, in such application to play the image, an IP conversion method, which is a conversion from the interlace image signal to the progressive image signal, is used. The interlace image signal is different from the progressi...
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IPC IPC(8): H04N7/01
CPCH04N7/012
Inventor KODAMA, TOMOYA
Owner KK TOSHIBA